Beryl (Aquamarine, Emerald, Helidore, Bixbite, Goshenite, Morganite, Golden Beryl)

"TB" (B31.JRG)
By Jeff R. Graham
Copyright 2001
84.2% Light Return
Angles for R.I. = 1.56
55 facets + 8 facets on girdle = 63
2-fold, mirror-image symmetry
96 index
L/W = 1.200 T/W = 0.729 T/L = 0.608
P/W = 0.620 C/W = 0.158
H/W = (P+C)/W+0.02 = 0.799
P/H = 0.777 C/H = 0.198
Vol./W^3 = 0.423

Addition # 5 - Notice when you cut the L/W=1.20 and the P1 tier it will meet at 96-24- 48-72. There are only four girdle facets for speed and yield. This will work in any R.I. from 1.54 to 1.76 (89.8%) with no changes.

 

 

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